Question

Daca
2a=b+ c, 2b=a+c si 2c=b+c sa se arate ca a=b=c

Answer 1

a=b+c/2
b=a+c/2
=>a=[(a+c)/2+c]/2 <=>2a=a+3c/2.....adica....3a=3c ...deci a=c
b=2c/2 =>b=c
REZULTA 
a=b=c

Answer 2

a=(b+c)/2
b=(a+c)/2⇒b=2a/2⇒b=a
a=[(a+c)/2+c]/2........3a=3c deci a=c
daca a=b si a=c ⇒a=b=c